Install faucet aerators on kitchen and bathroom faucets
Standard aerators have a flow rate of 8.3 litres/minute. WaterSense® approved aerators have a flow rate between 3.0 and 5.7 litres/minute. Switching from 8.3 to 5.7 litres per minute will save you 30% of the water used at that tap. Switching from 8.3 to 3.0 litres/minute will save you 64% of the water used at that tap.
Faucet aerators are inexpensive (around $5) and very easy to switch. Simply thread off the old aerator, and thread on the new. You can buy them at most hardware stores. Choose a WaterSense® certified aerator to ensure it is low flow, and look at the flow rate to get the most efficient one available.